I'm new to slf4j & logback and have a weird problem with MDC. I'm trying to run the SimpleMDC example that comes with logback but get the following unexpected output. Any idea what's wrong? Thanks -Roger java -cp logback-core-0.9.8.jar:logback-classic-0.9.8.jar:logback-examples-0.9.8.jar:slf4j-api-1.4.3.jar:. chapter7.SimpleMDC LOGBACK: No context given for ch.qos.logback.core.pattern.parser.Compiler@26e85f 12:43:59.539 [main] INFO chapter7.SimpleMDC - Check enclosed. %PARSER_ERROR_X %PARSER_ERROR_X - %PARSER_ERROR_m%PARSER_ERROR_n12:43:59.540 [main] DEBUG chapter7.SimpleMDC - The most beautiful two words in English. %PARSER_ERROR_X %PARSER_ERROR_X - %PARSER_ERROR_m%PARSER_ERROR_n12:43:59.540 [main] INFO chapter7.SimpleMDC - I am not a crook. %PARSER_ERROR_X %PARSER_ERROR_X - %PARSER_ERROR_m%PARSER_ERROR_n12:43:59.540 [main] INFO chapter7.SimpleMDC - Attributed to the former US president. 17 Nov 1973. %PARSER_ERROR_X %PARSER_ERROR_X - %PARSER_ERROR_m%PARSER_ERROR_n